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Setting The Rudder Pedal/Toe Brakes to Release the Parking Brake.We found that some add-on aircraft do not action the Parking Brake correctly, that is turn itoff when the toe brakes are applied if it is set to on.Most noticeably the PMDG737NG.In the real 737NG, depressing the Toe Brakes should automatically turn off the Parking Brake.In development tests, although the aircraft responded to correctly assigned left and right brakeapplication, the internal Parking Brake logic did not respond to axis inputs.So, a solution hadto be found.ProceedureSince Version 3.96 of FSUIPC (January 2010), Peter has included a solution to releasing theParking Brake by depressing the toe brakes. Toe Brake Axes have to be assigned and calibratedin FSUIPC.He states that the Parking Brake does not respond to Toe Brake Axes Inputs and therefore aParking Brake could not be released by depressing the Toe Brakes.So, to overcome this he has included the line BrakeReleaseThreshold 75 in the General Sectionof the FSUIPC.ini file.So, manually add this line to the [General] section of your FSUIPC.ini fileBrakeReleaseThreshold 75Your Toe Brake Input will now turn off the Parking Brake.It is recommended that you make a backup of your FSUIPC.ini file before you manually edit itjust in case something goes wrong.
Alternative Solution.We noticed that aircraft add-on’s did respond to the assigned key input. For our tests we usedthe PMDG737NG.The image on the left is Parking Brake Set. Depressing the Toe Brakes had no effect on theParking Brake.It was only when we depressed the ‘.’ Key that the Parking Brake released.So, how do we get round this? Not difficult.
The default key for Brakes (apply/release) is the ‘.’ (Period) key.If you have a registeredversion of FSUIPC, Peter Dowson has included the ability for us to assign an action when anyrange is entered on an axis.Go to the Axis Assignment Page. Identify and assign your Left Brake Axis. Repeat with theRight Brake making sure that both Axes are ‘sent to FSUIPC calibration’.Now go to theFSUIPC Joystick Calibration pages and on Page 2 you can calibrate your brake axes. At thispoint, it is worth checking that the Brakes work in your aircraft in the correct sense. That meanswhen you press the brake pedals, do the brakes apply. You may have to reverse the Axes.Also double check that your toe brakes are not assigned in FS (or FSX)Return to the Axis Calibration Page and identify your left brake axis. On the right side of thepage, you will see a section which allows you to send an action when a range on an axis isentered.As you depress the Left Brake Pedal, you will see the numbers in the IN & OUTboxes change if the axis is being read.Fully depress the Left Brake Pedal and on the Right side of the box, click the From button. Thenumber in the OUT box has now been written to the From Box.Release the Left Brake slightly so the numbers change in the OUT box, for example from –16380to –14500, then click the To button.You have now set the range for an action. Check the Up& Down Boxes.In the dropdown Menu, one of the options is Keypress and Release, select this option.Now we need to tell FSUIPC what key to send when the axis range is entered. That is done inthe Parameter Box.Each Key has a code of it’s own which you can find in the FSUIPCAdvanced User’s Guide. For our purpose, we want to send ‘.’ When the rage is entered. Theperiod key has a code of 190. The Parameter Box requires two numbers separated by a ‘ ’ sign.The second number can be left at 0 because we only need to send a non-accompanied key. Soin the Parameter Box type 190 0. Click OK.
What we have done is set the Left Brake to send a ‘. Period’ key when the Left Brake is fullydepressed.Now repeat with the Right Brake Axis.A point to note is that your setup may use a different key for the Brakes. If that is the case, thenyou will need to substitute your key code for the 190 which this example uses.-----------------------------Comments or Corrections always appreciated ian@737ng.co.ukwww.737ng.co.ukprinted 20th April 2010
The default key for Brakes (apply/release) is the ‘.’ (Period) key. If you have a registered version of FSUIPC, Peter Dowson has included the ability for us to assign an action when any range is entered on an axis. Go to the Axis Assignment Page. Identify and assign your Left Brake Axis. Repeat with the Right Brake making sure that both Axes are ‘sent to FSUIPC calibration’. Now go to .
